Device for sharpening saws.



H. G. 'GONRAD.

DEVICE FOR SHARPENING SAWS.

APPLICATION FILED MAY 15, 1911. 1,0 7, 1 Patented Feb. 17,1914.

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DEVICE FOR SHARPENING SAWS.

APPLICATION FILED MAY 15, 1911.

Patented Feb., 17, 1914 2 SHEETS-SHEET 2,

ammo srarns r traNr onnio HENRY G. CONRAD, OF CHICAGO, ILLINOIS.

DEVICE FOR SHARPENING SAWS.

- the device in part section, Fig. 3 is a section along the line 33 ofFig. 2, Fig. 4 is a front elevation showing the parts in differentrelation, Fig. 5 is a detail of the saw.

Like letters refer to like parts throughout the several drawings.

The base A which may be mounted upon the table or bed of a grindingmachine or upon a workbench, as the case may be, is adjustably heldthereon by the bolts A in the slots A is provided with the upwardlyextending flanges A A, which are recessed at A A to engage thedownwardly and outwardly extending lugs A A on the bottom of the slidingtable A and carries the adjustably mounted stop A held in position bythe bolt A and in opposition to the downwardly extending lug A on theslid ing table A. The sliding table A is provided with the transverseslot B in which is slidably mounted the bolt B terminating at one end inthe eye B and held in position by the lock nuts B B. The hollow block Bfrom which project two parallel lugs B rotatably mounted on the eye B bythe bolt B is provided at its bottom with the lug B in opposition to theslot B. The plug B which is slidably mounted in the block B carries theconical surface B. The circular saw B is held centrally in position onthe conical surface B by the cylindrical nut B on the screw B. The arm Cis slidably mounted upon the base A being held in position thereon bythe bolt C engaging the slot C and is provided with the upwardlyextending hollow cylinder C in which is slidably mounted the rod C heldin position by the set screw 0 and terminating in the eye C whichsupports the table C held in position thereon by the lugs C and bolt 0.The plate (3 is adjustably Specification of Letters Patent.

Application filed. May 15, 1911.

Patented Feb. 17, 1914. Serial No. 627,157.

held upon the edge of the table C by the screw C and is provided withthe upwardly extending saw engaging stop C The emery wheels E and E forma part of any suitable or usual grinding machine which in this case isdiagrammatically illustrated by the wheels themselves. V

It will be evident that while I have shown in my drawings an operative"device, still numerous changes might be made in the size, shape andarrangement of parts without departing materially from the scope of myinvention as defined in the appended claim.

The use and operation of my device are as follows: WVhen a circular sawis to be sharpened it is removed from its arbor and placed upon mydevice being centered upon the conical surface B at the top of thesliding block 13 and held upon such surface by the cylindrical nut Bwhich is mounted on the screw B projecting therefrom. The plug is thendropped into place in the hollow cylinder B and the cylinder so adjustedin position in the slot B in the sliding table that when the table iscarried forward to the end of its excursion, which,

excursion is limited by the stop A on the base A engaging the lug A thesaw tooth will just engage the grinding or sharpening wheel E at theproper point. The adjustable stop C, which is mounted on the base, isthen so positioned that when the carriage is moved forward the saw willoverhang the table C from which the stop projects and the stop willprevent rotation of the saw beyond that point at which the face of thetooth will be sharpened. When the sharpening of each individual toothhas been completed the table is carried back and the saw rotated untilthe sharpened tooth is in position to engage the stop and the next toothis then ground in the same way. When the saw is to be jointed, that is,when the tops of the teeth are to be ground off so as to make all thediameters of the saw equal, a round or flat wheel is substituted for theshapedgrinding wheel, is brought into opposition to the saw, and

the saw is then rotated allowing the wheel to grind ofi the face of eachtooth. If the teeth are to be ground at an angle, as in the I case of acrosscut saw the lock nuts B B carrylng the eye bolt B are rotated toraise or lower this bolt thus holding the block B at an angle to thetable and therefore maintaining the saw itself at the desired angle, asindicated in Fig. 4L.

I claim:

A saw sharpening device comprising the following elements, a grindingwheel, a base adjustably mounted so as to move to and from the wheelalong a line at right angles to its axis, flanges projecting upwardlyfrom the base and shaped so as to each form a track at its upper edge, aslotted table mounted so as to slide laterally on said track and a stopadjustably mounted on the base and a lug downwardly depending from thecarriage in opposition to said stop so as to limit the motion of thecarriage toward. the grinding wheel, a vertically adjustable rod mountedin the slot in the carriage and provided with an eye at its upper end, asaw centering and supporting device pivotally mounted on said eye andresting upon the carriage and engaging the slot therein, a sawsupporting device adjustably mounted on the base and adapted to supportthe saw at a distance from its center when the saw is mounted inposition and a tooth engaging guide finger mounted on said saw supp01'ting device and adjacent the grinding wheel substantially as shown anddescribed.

HENRY G. CGNlK-AI).

\Vitnesses SOPHIE B. WENIER, MINNIE M. LINDENAU.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Petcntr,

Washington, D. 0.

